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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '69ea9187f0e4cf2eba2b102b3c15f8935a5c98dfce48de81115cbdd0f94c5e10' 
  AND token = 'wSdIxHcTQjUtE6FYPAKoDroFT0AN+Xb6EWiQnE1PIU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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