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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dc2bf412d439237debd31f262ef1d676722074a2d8e8cbf8b6285f38aa4a7bd9' 
  AND token = 'h+KoykMxQ5s9PhPXpucT5LwqxcbeQkiw/dMq0tIP7sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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