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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1224001ae61782d9f664e9bd08787c83606cea11896da873b8b1563268360f12' 
  AND token = 'x0OC6FQM/qN9onQuwk7XZJaYSWXv7lCFBQyufM/fRkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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