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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1e5492ae4fa5eefc09f12ec12cada11a1aad8af5091a42d0e2ddb20ea02def3a' 
  AND token = 'qGwXNXna0XxsFIj8stDvWRXetUG/zMAnCq4LgddSA34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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