Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4978f04eff06de973350e27e9821b23042a1577c620430407fc944585a3911df' 
  AND token = 'nZv5/R9uZbtio1G8tXmypPZ+DPGL28ct5pCn1lyTwuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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