Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e14865f35770c195f2c643b7001a82d62842941fd5cdbc439a5bdfd4a660571' 
  AND token = 'c8esc5PdglW8YcIB6Le+Miki7/wq5qmmUqfpRd+4z0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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