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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bd685aa5f313c9be2ca4aa2d0cce950cc07d86bd31d5cb6e3fde79eec6202822' 
  AND token = 'ukAmJ9SNpQN1AnI/oibR+XMmnqWtBRD7lV0k8nQCzdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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