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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f07861113a97790184c8610ed98720b3ac4e3f2ae2daac36d027d2af84f84436' 
  AND token = 'ap4fPtqA1oynGVX3oeLPXC99C8xE6oN3d3kvtYYOcV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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