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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '12eb9ad9d734f76c963a9e31569f9e2215a860623b77f7279a63ea64de186cee' 
  AND token = '7KwCCdo2Ss7NQV9rCRGI0tGP35IrasDU0SYAHoXS8Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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