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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cc13d70d67a12b9e20d4b8fb0af05873b1fc1292c0db0bc2bc7c4c2b5d5718af' 
  AND token = 'ygygfGL79id/emA7kQFp9ElJ0gDnDGf7ihihndEckwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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