Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ea310fda02a17a73fc3bcc352a5974593ad40b00b0dfac849f91eab9b34a12' 
  AND token = 'i/B9fZiQ4F5eZafYJi4TZQnLEBYhI+2JU87nsmpzBOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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