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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f380072517693ff587d774f2efd0a77509928a9fbf8e60fbac783783106cf18c' 
  AND token = '3PGTo8U0bVg+/WefuHBayEr53tsv9NJnvhUseVl1+rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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