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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5f8d4840317372ef2ba36d4269e8d27036a946bff602df4695479a3447cc41cb' 
  AND token = 'QB9XZfsY4plf854SEggetGPn4yzdXnQFxknOfqdlY6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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