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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6beec7849bf5452929a6be69f8b33fcb9e6b06b581ca5997355215d2f292ad7c' 
  AND token = 'O9+hyhYiyksTJ7p7YxLMum6OBNtOuxuCIsDgAd5IB3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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