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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e8384066946e01b0e895af040a4370c9e12007ef59e13736269381cf25c9b539' 
  AND token = 'ZbQVLz+0lOGuTqrc1L9hrbsrOHDX2cdH4Kfx77pLit0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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