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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd95cb0b0b75d5fc5a2756b47d8df5c25daeb9b905da412e4377f30ebfcc0da18' 
  AND token = 'VnXVNZFxn3IR6L6XcF3xBQVAFibUdS2cpDcP1CZxcu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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