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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '85a42bc64c66f2e8895b5220e557bdba90d9c2d656f61d80ba7738bf771c17cb' 
  AND token = '7ybUzHOpKs8hRNXwndTLPZbxDaPZZPzm4kCNMRr7DCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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