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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '799a56ef46af331e2ee809d0ffaf84d830f8e459a3985bb3baaa6cbe8aff2078' 
  AND token = 'WSadBS+zBMrqroCfXXrBAon8k6GUh3g4BmnIO/kxbzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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