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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5f9fc01edc3ea0b619a4543d546ffb692e18a014889599e732a027c4dc3408cd' 
  AND token = 'pICiKF1M0Z5rwdprJl694VSTK1b5kMr6Jyxkd4oI2g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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