Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '537621fd6a535fffd1b8b76c720a5cb683217e0958c42dfa95d1a626153ef80b' 
  AND token = 'c4kgTpK4/BMX7PrdM7hPmOI8mo8HTpCg8AMYCgatiq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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