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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '65f6d25661fbda5ebe7e04e7ce5d5427607c96417a556759a028cdc14100c151' 
  AND token = 'NgwqqkGMpiNIHu4nbGNcZ8lQVIpZxRdDDeupZ4t78U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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