Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1158f1e89658bb7b96587eac0d4970c7325971935bd73d922a41d20931c982d4' 
  AND token = '18u4BVUVEXVj4zfl0IbBXKMOlmp2bRjRfXB0bLxZJLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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