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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9cbd26057e90d378555f223d1d792cfbb082b2b720209015a29c0e5f32a9568a' 
  AND token = 'YUIUJooC5mGqfAOyqL7pBAyGeT2NYnuMSrT6ZCswbjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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