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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ddf1454de32ccf291151b32324bad3d7168aa5fb46a4661c875de2e7a5465b07' 
  AND token = 'NaL5JvVABejB1WAKUcyyAbuH144hEqWcPWuLSqEUm+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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