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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ef7def7ddb53007803e5f9c28e8bac823421b46868491d2bbf1a65baeff85975' 
  AND token = 'Vvk1ckjHWCdwY23Cj4AXcLait9t0pkqfcXDLAHQsmZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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