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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f7cf1e6a9f781028d199239c165a04dd88f912c11ecc69680ecb629bcfab5b8b' 
  AND token = 'ccpuUlJ5TXZ1PAdTuKcJ1yE0udn3TaVkBbI/uu/VAY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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