Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd75ab4369b06bf02c3b4807c4d922e38937d79ce7c720868c4b10a301a4c5c8' 
  AND token = 'jYbcsNBPhM2TkLZkETWvhaEZSaiUGmXCOK+3zKBOPr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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