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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e25d595b39502add2077bc476a8a394852811f19b32e2f68a93f321ca5d0fe1f' 
  AND token = 'hVIu5EFXy+1xdyiuk0MgME70C8Kl9VD3lMR6b0T7AUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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