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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '99d63a33f7dd935dc437ddd17681674295c6494e0aa7bcc387ddf44ed8812633' 
  AND token = 'mdZuRpaBHW0M3XvcHMtAdgJOaMCgHHTkcxooRVGe8e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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