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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cbd55c51e8b2b51f0fb6ecdd4c0ac080d76c6ccaa3a811ff3728d414f338c1fd' 
  AND token = '8oSoggwMkgV+qi6WbAMFH/q85nmjLBgkJPPcjVP8naU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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