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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '76e52b4afa766336f6be5baccc1ae9e2678cf87f55d1b1e9a2cb0e6cb8786718' 
  AND token = 'fIyD/CbshRksCTOuYX2fvZo4bD43qqDz+ZvGs5esOqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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