Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb3fc38d45c76ff9084eb383e3097966eb4aa0c00b8e6c2b8ec1b0256a94b7e' 
  AND token = 'jivxSkyLZgTnCC64OL3ReHwJgoDU0aBZ91QOSGn4So4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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