Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd75aa16c131848c2afae2d00b4597c2f8f63dce78e79853516d65fac0a9537' 
  AND token = 'c56HQeQk4piWjyW+H4BIppdOvosekZybBxXA6He8VPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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