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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bf7bdbadb4504e42f7d3997f4d787d877c785ed15d4cc29a35f054c15e2770f1' 
  AND token = 'nN4TAPVDuws+Qu7VHNUEk0nYfN0tkfxg8MvxL6SIqgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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