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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9a734226edbfb498f12cd63ef0a5a2db2887db6ecc013e3525c9e3b5c3f2a428' 
  AND token = '/2fb2SfQi573PjFCV53AjqGeBAx0/janLX0GH/TgOQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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