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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e461ba552b8c6dba729153fd5ee8c960104c41f74a97d9f64d0a2a8acff01a13' 
  AND token = 'rWWuomAkMU578oAlsg3me+cfAvd0g0A8BYWrNMR+95Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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