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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '87d18c90e011d33b0234c02328d6a248dacf3470c609e8b5b8baa37542a3429d' 
  AND token = 'HzEGMQomneGk5MGEbqKwpbcvoDfGvpI0abLD3QvUaxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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