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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '20f4e33afc7c0a897188db8d1b0406364e81e3b4a4d52bc91f8cd195d050dc2e' 
  AND token = 'sxbOfQwd7zvi5zpvdveuWjroxkiyzDMtEnhluXTpagM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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