Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45238ec84ec83c8f27e2ee6e2b68a41d43732b67a2e3a6fb7a35e22cdd6c9672' 
  AND token = 'q74+IjGIHyokMdLG+u5SfPmvT2TDDS4aZ6UqWZRmXJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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