Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d0794470979001c94c369acbc192be983c4d515b9a15f9eb050d2576c3eb82' 
  AND token = 'u3Rn/m2QqvYi1Iq76AoC8F+tY+y/UrZC+7d1L8TRmLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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