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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4a85be80886d7facfd3b55df8e40fabed4d52736e7fd1820bb9f73d5ddf722e0' 
  AND token = 'sRAuSrVFBTxbQE2LC6PTU65H+mkc60lRgkDPq3jrrq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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