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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'be29526428d62a15d720eb4b4797ff82daa431f9a93218b9d83777b41c380fa7' 
  AND token = 'YCe6TUKU4e7jk8dwfOtLC1L+yFvtSgNMq0+7945k+Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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