Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd789248a7109009862480fc4fe5def347d8312e503e0f80878bc4bbe91b83d39' 
  AND token = 'za6Sf9zZNpz8QQPC4G+ne4/C0tE4wC9+KFNZeMb8PWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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