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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7ff6579d7aac69ff8b0388b5c1989403c966418f4a14769c80eab20b136bfb8c' 
  AND token = 'c2o8FkCPQcGyxQRP7S+J01eLikpOu5xn1720QSjxLLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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