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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '255aa34023a427b5ad5c9d33a6bbcc63c85b9879ee55ac7f39b2586ca7fed009' 
  AND token = 'mMkbY/qhXGLkPSG6ml5KaXxzcRVrR8Pr9cqHXNnKpyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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