Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f314138c89ea2218404134e967432347143e7717d786bed7fec4636552333afc' 
  AND token = 'o7KYx5971UnVUVg5Ez8c4p4GAEa9gPyRS9gA6s4Kd0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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