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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '52c688be9a9139bc4842cfa913f3d9b43504e366f8dc871290a8e8765a9b301a' 
  AND token = 'aDXrTm0I8/n0v7QutYYkZyHBusMvbtcGbab/6YMxga4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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