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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dbde43c5d5deef92310d52f8c49c61c1ff0ebfcca8fd4af2b2806cf2f592e502' 
  AND token = 'NBJdsYPelR5sTGOAUswIyempk4a0mIbEZCHOZBiGpoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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