Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f7d990fd67d6f2dac33dcf2aef6fa619d51205484d61eca5b65e45241d78e53' 
  AND token = 'FCPm/MX1EEMjcpD2n3P8cP37NSTVpdQs5ss2d0cu+zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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