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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4fbd502e0093385b0ef0efe7ecfd0c9600519c991c55733b48207220e70f4774' 
  AND token = '3wD+NSQBXNLCrkxrejU7a6hiGJzfOxUx8MR0lbRAfS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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