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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '81ea00e03ea454b0008c909418a6578a6ceea7e216733856ba65a936a5be8dbe' 
  AND token = 'NGJxg+QnW7wTgdJdyOlyE8BocxEyLABea5Ak0YhwUho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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