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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7da18a48f332e9fb677d35c2d93104a73b5710005e9486ed27d29441606240d2' 
  AND token = 'NxVid53uxyuD95LiF9vGeCR3G80vIrc9OPQz1ViWAOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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