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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '925214bf240c086a61a5f44213f7a95c4601df9d87c0b12cf8b2a75d8c65de3c' 
  AND token = 'CH1/os9j2w0T1EtpDUrJzIq1rpab8b1hwkPuMQS57us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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