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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5fed82042fa8d2409c03ab77b47761297a90da28d444e6ce6e2f68722e1b792d' 
  AND token = 'tB1fv4A3X8pfF9GHSZX4p7Ye3Sw07HjVW9Xo+hBrbII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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