Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32bdbc3de986bd9aa4d2c81fe7cf108fe534affdaa1ecd5b620b5aa4534be5ce' 
  AND token = 'vxeUJgM3bK8ZDwlLNPsRZjh+3DDmNHEL1VgRM2EZ45A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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