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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8acb96b68280b624404669cb2fd5b27d79732c788196a5b86d9d0f2bd8f61a31' 
  AND token = 'RJjVzFTFrNFEqc9xc7UvPZpbR5pI0IeGbZjVTlRly3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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