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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '29eddfbbbff6e54a1730f297c22a50c1f69ab59946099b183df2404899e3399d' 
  AND token = 'HgnlS1it1HMjpTgtz3aTfzHNvd7/V9EP9BdnwjIP0D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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