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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6e05ec4da9767ae53f5a5d8c2627619f7dc0b11c5095c2481920f1343a36d845' 
  AND token = 'cxbn9mNPp5rDyI7L6lftEVgns5iKzOwIXShzxMRw1D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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