Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff4eac1a9e1f7f52165a86ee7680462f331369692ba8c100e341ee1507bd3b67' 
  AND token = '5qtlfmwdqC7RJsfA3z/WY9RHCETtMiEJYt87KmCVVNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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