Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83735073378ea2875c76f21740c6197708c4211d330360d77ab641ffe109f736' 
  AND token = '+RKgbQOmm2X3Iigf7MfF9JQ0cP2FdK72dMk4KsCgkRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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