Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94a47f18f414a2d0743e9e703c2673bb5b854c1425b14845689cf07b88ca9f4' 
  AND token = 'aN42kXrSuJWIljl7u+1Wq5sEvXfYibH1nj/otEUVJP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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