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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0562c5daea75102e4a2f8f5fcb0d333a85767f12f7feb754756889924fc2b390' 
  AND token = '3Cla1284TauOXR3U3U8TqbGSwEuk4K8BQtfj7f7OZZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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