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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ca2112a8e9ebb01a384f7a6ebe9c9e53235128baf9d2e5726f9f1cd6e7767cd3' 
  AND token = 'P/w43CUyimQa4XVBDaBM9254od5n1NOlNUoJ4Am4WB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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