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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '72ea80b7b624cb6d6d519e5928ddda44aca919cfb176d3d031a718fff34cc3f4' 
  AND token = 'W2RDSlK7GBr5Jc+5sltOIg6SRF1m5MvE9qfOXFlYok4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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