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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '03c54a3e8b0ece978bc2a78234aadf0c960f053e29ee26dc7cb96413705babd0' 
  AND token = 'D2hHysu4Mq6tAK7wkf9RHurzAwHz+YQ72S+uMUZbejA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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