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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '326874a00b9829b2a618f6dad98f46f7c1a7df005d76dd683de4cd1df7fb25be' 
  AND token = 'TiauztzLdq7uBoW8ezqGc44AjAH4D5Sc0UMeMm6dJUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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