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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dadd3e136ee7e9bb8b14c2237c317e044e3c10e6d8ef01e92fb559f9def0f70c' 
  AND token = 'VchoDhzlNk974utw8qw6j1efLChkH6FXvn8yi1LHTb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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