Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab715baf3341f2ca0014803578b0ffb41c37da31ba0329113e1f9f3078439d8' 
  AND token = 'My45B8IfHcpX0tamitVpPos0+kcQa31CVOUCrkpPMrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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