Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db121cc55893c13fbca6676d88791ee2f04c68d0bcd2fe2f02b605fa9c12e483' 
  AND token = 'nZSMNAj68wXn543Myxz7RR4uE9pPsgyOAm2jUoMQ5H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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