Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8e321a66f65a820f3b47b617415e2c80473ba667cde9da5528ef33c1a86f07' 
  AND token = 'byGwo3SW44tSzTSYUgmSEZ2ladzCAARz4Fqvmb+8LTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}