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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2c86c3a8194a6ceb0bccec3d0f7aabb791e8ac6be1a8847df5db4d20264d8301' 
  AND token = 'CMrkVa7cx6gUYlJtWGoVLPqdBDUY6/bUH8FLdriQpQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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