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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7169510023ac36ef7a83fdb473c4d5d448dfc04ce3a20e81e8dffaac3309a9c6' 
  AND token = '1U1f6t/b150R7wyHTqAOthfTkLHcm17q/FTVeV7NExk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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