Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345f46d21894795fd45430cb444cfb7e35321d82f02fee1a41b04b9dcc8e27bb' 
  AND token = 'RXmKRNs60tgjMQRpRPOyy3fuJwRSPGQN7PNgPxE4Ku4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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