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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '06163267747dd62fc36d3fd5d970c4e97fbd5eaefbfdfabe6fb9a9229c835a3d' 
  AND token = 'RiyoQALOJOG/QA5sAFvMxLiKzPMbGSdS2kvk5FyS87Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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