Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e702a5215390fbb9bde54bb1332afcc335ecdee11a9dc9bd6ea95210f7bcb78' 
  AND token = '2v+ngl+zHTZotEBKMSzWBP1qwtWeX426Uu9e+iNoLD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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