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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ad5e2a1943fff7a8a5f93b93c2c70cb4e4072628cabe000c856088ae4707d233' 
  AND token = '5yIFO/XvmC56kd16o28ah1w9lIaRrhhY+G9vqwmT80Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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