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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4dea2e1dd4ce5dcac9e059c97a62358cb25e06e46de9f587da0b04740c78acbc' 
  AND token = 'kNEGl4Kiu/SEp2+HXOW82LRmofP67y6wLvDcHhS8j/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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