Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fecaf0b25925ff98b99a0cf7350f6ca74c798bc4fcfdbca8ab1570ee6c8f667' 
  AND token = '+y7ZZB/MwI9QKg+PsuxKMhSkVoCc8urBQojOBH/sfvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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