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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '24b0739898481393cd565f0c49480464bae599c85968fea5f9cd853f787efcd9' 
  AND token = 'SuwpdD48NY3OrCiibzaG+mUiE4yNkqWWG3qEgqjYLzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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