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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bf0e9946a130f8d1b0e73272bb49cfc7f50a287ed2f05edd6feb78475dedc69d' 
  AND token = 'Pc4OE1MnE56ALMY69qWlyQ6GflliqSVWRYvCYLPXPXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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