Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900e5c133a54cf039ed514aabfe7ca6da29e1763c909a7b5eaa385a43149809c' 
  AND token = '3adYNSEHX83T3ABDdATNnWY0IgmDNxrnpED47/phTQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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