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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bcdfaf78e1e17e945d8ae668d8527ed47cfba6d00f1895e02da55ddf3dc35007' 
  AND token = 'AcjJ2Ziev/2DhJhe1OQIABCciiT7WHiQ7HyZkhS+DR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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