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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6440faa4af4d7f75dac4f4ad4cd82e4db620f13493ac2c7375636c93d351b083' 
  AND token = 'r0dHORa/Wkg59d6tkcBu3mj/E7KC3SmdOTbBsR9cWY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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