Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4dcfaac0b1d7104a0ebf9ff3e370c028abdad620bd60b3d62fabe70757631e4' 
  AND token = 'l4F0HsqajlhzdDB9E/Q2CjuZ9egk3Qfp2pNXsF2WUAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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