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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a548f43479a6cbab201596e489900f19081329d3e5fb8bd245a4ec89b53c0e34' 
  AND token = 'r26A6NI1re0OCzuCfG/s8Ol8ueHYY9zv6mUAXbHyUO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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