SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0f673a21a5c0e2071123225cdb5cbe5c2b8152d6bc10a94310365744c8b6d7e0' 
  AND token = 'pjrvApT9UmfKDBLC+xaZ86Edgd3T5+3YPA9pSNhuOo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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