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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '31b0fb5abe32c3ff8b46369bd2171a6452a3ffb3039c6d0f2753e841b31c4eda' 
  AND token = 'erKtmHk9unCq9ENzHJaNUwkhI1DTm7rnfOFsQhDVEsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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