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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7970813ce955714397132c6c737b8596af7d58544aa9fc203c5cfeee459e506a' 
  AND token = 'TOcbVMRAsBBSk7HXG4P2pDKx52p4nAvE7qa2J/xhGe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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