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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'be0ee399713d9e85fd140497ff2c20c2aceb12bc9adfb621f65cea655551db31' 
  AND token = 'hS4KgS0BmTjg4B8KFWwNz1dTPFdZWEMLI1yXs8kLRrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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