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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0e30adbd8f0f8c203ce5ae4daf64b3dddd2aefbd3e6feb07e42bdcca3d5c7001' 
  AND token = 'GwGLaG1H+Ih0AtWSG/eOEpJxHPaF1w9n0x5ods9BBPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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