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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f8f1c675a5e5394d69dee61515f79afaa58bdd49be3091dfe6f9cf4099b1ee89' 
  AND token = 'ohS9so8RACupIAL0plkhof0Ge376QLRF1bFGITecwtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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