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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '817ffce43ef10aa295e065b59018492b9f3425af55b7cfa1d0bd9a6a335b5362' 
  AND token = 'NlM4Co9E08ESvBQXXAqx9aWvWU9NhoF4U/QWGAUv/CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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