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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2d01e0e22f065c2ef69707dbe914ae02799459e834d102c473b7b4525e57a12b' 
  AND token = '40Bnk78a5W/V//Ms/vstyOrhUDd8bGHaYxLSzS6Zzcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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