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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bea2018bb8a08b36805558dcd71a89080ff91b9f44c6ca28496ba051f3a6eaef' 
  AND token = 'sHR0IKMv73EfoUPmTlT8JPnLs8CJDs63xkUNyp23R0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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