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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '32479ec5e7b39a9f0aaa0ea6e89d00f045a589a249f8c180337e9359030faf92' 
  AND token = '9VtVGIxn5v9ANT/kQ6RoxuJXVdqJfEurRr1++Kqv0rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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