Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78fb5d4a14b5f7e2d3a9907b7a05d5c3c58fc59f4f40a14b954cd14bef6b0d4a' 
  AND token = 'NdG6sbbtNqynyVeeO2WSn2Ij4uAQZQBL5c5K4CPu3yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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