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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '19e8911fbeb5790c8937d4b9878787697055f469a9b390afa6c3aea9bcf7361a' 
  AND token = 'Wdbn1WCYcbtFfoXiaXKv1cIF4jPCFOpq/c2Fse0oGwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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