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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cbf0abe22480e9b165bdb5d042aa5235ac17c31ca0be1ee1f0d120b4c4bb77eb' 
  AND token = '48WZwiT4H/DoAG4ThbAhcicBHRka8qiWIt9HqO8PhsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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