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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '269502918f41f92abf3ac811420dbf2db8b94e8e02fabb8b3215eca42bc62151' 
  AND token = 'L4SsZNxlqEE1iAVHMBT6W6Z2rKvxmBtm12PKL5NJFlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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