Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7a419e0a9c12519736fa5e6572af3a06148fa010245626b84a7093969689fc' 
  AND token = 'u4CCoMXkSIit5nmrVHDPJdtfhFKimhNx2QP2zFkjEyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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