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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '33b44a76c26c743fe99e8380c721052ec3471ab4dea384c93906372be6dda329' 
  AND token = 'vjUX5Ny8utbz3Rfm6l68MwV+JkVFTPW846MV9AOn520=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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