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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fb8731ec806d9a9e4d218c8882e58d7347dc3515839d422f2ecf2c0978ddaafc' 
  AND token = 'FQKR2n7Ete2WH3wkq1L5tenI2ARK0vddU3m3XGMvvVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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