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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ce3ff4f7401ea8cbbe63b547ca174829617cae8478ef8f562fe72d0dd3f917f0' 
  AND token = 'Np2cskrvZ08sktlwm2FSJJR70NNyaf4BxXq8Ttk0X+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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