SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e089a9f5506a41af5f898b9dfa71d25a387499215566ba77a8a8e641ab7bdea3' 
  AND token = 'WU4hP2M2YpoHjGp9ppct3+LTIyGK/PqY/+DKAliaOts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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