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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ba964f6d9bbb794420fcbc4569add65cda7047a388d8c704e6e01c67fbbe385a' 
  AND token = '9Cq9io+jzF3x6ecU6Nih478lYgIzs1G7JbMdJE94wmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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