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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8fbdc562e4d4898a459b6cee56660deb724e354a11d158f8569167e2e62b0d1c' 
  AND token = 'pKJENMT6zBwb4DZyPzJi7BYIHMGHcsf+1BbzSItfSPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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